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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b2fcbce03ceb053535f2aa9d409657c0319232e75e2f11a7baf5e0c37889905' 
  AND token = 'NiRi/KfkarUdJQXKl4Kghc2dDt+5gBqvRhZMBS10v5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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