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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4ca6d27d37312eb8c37b1aefbd2e74cf19a46a2f32c20f9a4e205cea68c21a4' 
  AND token = 'o454RiQSVN7K0ukckBEzzT03wBuVI3yPtI+5m4JYlr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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