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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d8a0253d2dfdc5579d21f222a92f9a6ecdaabc782bb67c01225fc790b5ec6dc' 
  AND token = 'BjNIZOrrpupGgjPv8G3n/wNzVaAXkYxGxfN8I6/U2Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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