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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c08ae480d7cb880ce83f95ae82ab1dbde3b3cc61c19ffa6b01038b2a99995c' 
  AND token = '1JZfTCaeT+Q8Z7SL7rCZXR58ooZS/qmoIOA3CLjfey8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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