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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ecc0db44c650c9010afa408eefd6a3b0834e29bd4c9c27f0a520f18b33322e2' 
  AND token = 'q+7FXaDBRilREZkQE3J6OHafBuHRZ1UC1hdG6DVKZA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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