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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a26ed38659d7f9b3954b4f8e210fc9a5e89bf279360380ee4079499d0cd98b74' 
  AND token = 'GdxEIbIXRqoUkRhBVy5lm2wEmKJ41+Pj7wxyhduSwxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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