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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d27667c9787aed98ff94fcea1bb0ab408dbf31959d27f3961cdfc58832c63e0' 
  AND token = 'm9L6cJvjtHKLZUxnqF3QJ+QJWgTUF5D7RFiZa+Rf9xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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