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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b08a4ad5580e14651f13edd76f85a389cd5a50a7ec26a22c42fbe10ea8857a' 
  AND token = 'JLxOYWNuv7xrV5oAoGUsz5OjgonRwJ8lym5VC334gfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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