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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a2f2be03b57bfa94e86e48d48bb6eec15ffb85fc9405b721556115f691cc84' 
  AND token = 'Ddd8tJhY34y7yDXj/rX1gGEFTZVeKxp3r3kwkVHQHfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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