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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f5f169b5da3d50d2f86b7eeca6a790d2296315b7e70eb6124c5af7b0055406' 
  AND token = 'kHdZoEMEaLBa95hV5FIhITlwpPh1YjeyPrZavlkuBZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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