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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c198989939d1d9d8dcd99e916c5a18b73a20a4be1596a53f6bdebde5198e8f5' 
  AND token = 'kdF+SM+FuYkejhwVRJdIygdw872ASAu3npv2R2aCuBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}