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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c36d3dab83fa78eebdafce1912434c4760f7c06da67e10d36b25c46018076d' 
  AND token = 'lcVnjlkb1qntQNLJCu1H3/5NshDCxZehWUE5dH/o7Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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