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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f549f30afa19c01a3fa6621a558a70eb76787c83cc87659e19f0e7fd26bbba33' 
  AND token = 'fqEZSeQ8oROYEFWJRZ0KYoRwO/rIVrQPzZXedMXwjHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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