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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1dc292a71b243851b6248aeaf656933a57404c8590af6909149d842089f5064' 
  AND token = 'oEnQof8SA3dfD7j0jp6r9dyqmn6kLApVKeE9FpNBtb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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