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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab6e377ee02209e002902ce40c35017cc61c4e7ef7ab64100e0c41124d459988' 
  AND token = 'uBZaPB0ACvSZzxilGnY5HpwBDyw/nbK0SIdgpRI9adI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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