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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1893b3f233e308c5347072c091d2bfba0426c01ee2fd8144d13cbe180daf6be' 
  AND token = '3g7dD+0n/eDI403/wAiix8qQ6rNTcrQ7LncxMN1LIt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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