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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68796a2b9093cbd789f272cc28fc9bc8d851c61e582981621d9df30730627fe4' 
  AND token = 'i6ymc2pazwkwiGilV5/Nwrdq72/eVa5ZkLOtnj6KDEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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