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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7473c4f707e0bc33416919c0b1b35ea0f0344cca8a99d63b07d376e702f67e2' 
  AND token = 'k2YVO6Ht9ViPQyxUmecMVrflxnOgXthxK14xxjMfMoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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