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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf85e455e119802f64a3fa717f18f8913d2b459e1fff80dc830f079f72f78979' 
  AND token = 'MCbfUoZGMz0+URQhIHKgA5bEU8M74Q0hmi8UtXjL+yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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