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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cc87aae016e9d8f20dcd6c90626ef565bda6314d04b3dcfa1d7fc718ddabcf0' 
  AND token = 'NRhIENzdc0Bfhipy9TpK+0lWT8JNWi6uJOm2Ti05r+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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