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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0cdfcddda3956413c2c3a66f4564aa3012aeac8451e6e85550e6e6b994b53d' 
  AND token = '7UCTd5w/kTfh9BQo6L2wjQjwtr/Hj9X8wHjX43Os1QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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