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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f4e7a600bfd3c52f6c96a3a4fdf82c1261175d675305303ef1b0de6c0cff9d9' 
  AND token = 'DdMPHc5Gy3YfX5jaovbsLjUxtKkte1F4thyoT53YbCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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