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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc2dd38af5ae7479b3dc64ee2b628de32e588b01e37787ff33203e6177aa834' 
  AND token = 'wLfNv5jPnnSGbgtL9UDunPDXu+cp2QrTn0b489O27Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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