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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a97dd9986044c5877f8a6fba3501511e4db73a8e42be6593fd00309c9fa5268a' 
  AND token = 'Nuw77YelE59+YBn+Q/3B3YbmRxqa8A0m0ATifsclb2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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