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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ed77427c7a13866daf4fd143531c95873631c92640542e0f0c2da4ff7c902f6' 
  AND token = 'Q2diML00Ys50R2FUzG4eE3fB2uMSuLAXvpSxFKMl9+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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