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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48d40d881309bfca7b58903d30b930c1c088c3235d7e1bae186e8aaf9883e233' 
  AND token = 'uZ3xKR0g5E5+P8fc547Gvp5CHc9mN7e360VF2N+VBLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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