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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f189cfde2a013a4edf47e32b9b96d82a5afaade84c8346d6b0fb2b84e57ddfdd' 
  AND token = 'fk+Ce1jcgIwUlErAxEN/n9xa3p78ltKoGTTMHi5FYYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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