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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6046cebc8fa00db17b23c56d52c97cc9c0ad994e4cae99d983190e215b381d31' 
  AND token = 'be3oWDgQ1SXhatVcuJFrErzB1neSrriMRk8DVuhv8AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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