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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88db24a0f0482995aa09ef7961c04d523f2f5d2c0e68c1e426b933d2f294ef60' 
  AND token = 'UExL0sn8b/oQkK9Rf4ACB7D401cUx0PMglfpfEVkeok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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