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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64ce42989eda2b2c47e93e2f9b8826af349d766cefe2802f025f468c547b3d59' 
  AND token = 'yZuH3RbMXXQoBzwfNZE4oqnfqc/n1SV4p/Ge5aGnPao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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