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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93cc7b520d371d69b98b9452d37963bbc05e4ffbc3f4bf20b6ac4e368204dcaa' 
  AND token = '90DTj57KgyMsWCgvwN+iIthBnDX8t8I0b7lfqqMGAuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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