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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ec2257a46397cdf5c4b2b2305201944f1534db87091ef41c9f8feb1fe5071b0' 
  AND token = 'H1XC+LzlW2GdcNx2Md2xyDoFbhgqzjbkplFijBiIVqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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