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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41f74fbd0bbddc79da3f6402d541006ecdb3829539539c221a3e7e7829bd27aa' 
  AND token = 'NGHk7yPwspb6bmBpBKZ6i6M8FHXNWk2raYiDEGpOMVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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