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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab1a7c61065c01db5f274a5d189ff1f0aeb16ac74d7e7f6c0d7556d232d47d4c' 
  AND token = '2ibDffYNvkhXegfn7ZNsaUooCJT79LbwfLuK0UiUWYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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