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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '932b2875f64336d90c1f8979c12a91ba0fce68e0b76399f344d02e1da9d88007' 
  AND token = 'L1HaF2oMDMcWWDZ+lRM0XwXmOCR00KUsTZ6TIzqFNws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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