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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa1bb00ddc12ee4cb4c9357840ee939102d507b0ad95484e0c5b5a736f860d4d' 
  AND token = 'A2sdUzp2MG4XmWJ7s/2i1LYEazEBxCMUU+C4Kntj5Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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