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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe97a72ae8629a922bfbd265cbeac68e1e792dfa77db0d184ae9e3fd82a6042e' 
  AND token = 'mV15LSxttVxzXUED2bKDNm43+ejeOoQnYj1hFKSFKeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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