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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3c5a4f3a15fcd923b99f15b179335ebe89dbf9166c5e84bbf05a2bcd765289f' 
  AND token = 'WZlrYBZyswbMDfeNqyrZo3UV2nXYWlS7soGPoGoZN4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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