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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '738f85d36e6d653e857c36e00929a9435f15a8056979f52985ecf4cf17cf1b3a' 
  AND token = 'gAuERM5lLRM1s8LqJaV72svrPlWqVi2uLIC+91DEKfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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