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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7df42ace407626256fd12e09bf167869d202e23664c3673b688b61d66fd6fe2c' 
  AND token = 'ZvuleFZnJOO8iqkqOHi923ganP2IxUt+FfEMe73Rh14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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