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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '247b45fd91d6e40d0c6f1a28708361995c3b019c3dfb2656aa089982dfd044ec' 
  AND token = 'Ft5L7Kk+cvwYrQfxkmySnjXUATVps6OkeXDREdYhF44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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