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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52e03c73c7e615fc5c08a4eec7b60077ec9a2d1644bcc623cd03f7c8826b3d26' 
  AND token = 'KKJiHipem1GaSVFitsq4oP5GJf2SM/Pd2nJpE3wWxdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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