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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f4499061840113865b8f3359165b1b012b18ed6df2af68ac50ad735d1af1f6' 
  AND token = 'OGW6sxtG7szr/L8aIcb7FiMYSfhO4uEntaRwe/K1GI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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