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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f7fbcd371f2238fcc77e0806c0d3fc9d15ea8b0817ff6403116179c9b3a0c1' 
  AND token = '5mhD8U7/RjgOQQowj3eERuBGwLLtPrkFGybEwQjPTYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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