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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a00083a0328d9c811b3a86eacac6ef78924c2c1ddafcdc8a1c48dc2269d8f5cf' 
  AND token = 'CuAD9mjBgraScbIiQquatgZEp+/3Z4RS1/7ksFDOayo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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